314 Frederick Chapman: 



5 — Lepidocydina inaroinata^ Michelotti, sp. Median section, 



passing through the raegasphere. Filter quarry. 

 X 20. 

 6 — Z. tournoueri, Lem. and Douv. Vertical section, passing 



through the niegasphere. From limestone of the 



Upper Quarry, Batesford. x 20. 

 7 — Typical microscope section of the Batesford Limestone 



(Upper Quarry), showing the relative abundance of 



the Lepidocyclifiae. x 9. 



Plate LV. 



Fig. 1 — Lepidocydina 7uarginata, Michelotti, sp. Lateral aspect. 



Filter Quarry. x 6. 

 2 — L. marginata, Mich., sp. Portion of a section through 



the median layer of chamberlets ; showing the 



spatulate ends of the same. Filter Quarry. x 18. 

 3 — Z. marginata^ Mich., sp. Vertical section of test, 



showing the thin pillars and crowded chamberlets. 



Filter Quarry. x 18. 

 4 — Cydodypeus pnstulosus. Chapman. A transverse median 



section, passing through the niegasphere. Filter 



Quarry. x 18. 



